Dominick Geoffrey Edward Browne in 1901, the eldest son of the 3rd Baron Oranmore and Browne and Lady Olwen Verena Ponsonby, daughter of the 8th Earl of Bessborough.

He was educated at Eton and Christ Church, Oxford, before joining the Grenadier Guards, serving 1921–1922 as a second lieutenant.

[1] In 1927, he succeeded his father and took his seat in the House of Lords as Baron Mereworth, a title in the Peerage of the United Kingdom (the older barony of Oranmore and Browne, in the Peerage of Ireland, did not entitle its bearer to a seat in the Lords), although he primarily used his Irish title.

Castle MacGarrett, its 3,000 acres (1,200 ha) and 150 employees gave him the chance to breed racehorses and farm on a large scale.

[2] In 1939, Oranmore and Browne tried to rejoin the British Army, but he was told that, at 38, he would be more useful concentrating on farming; as a result, his war service was in neutral Ireland with the Irish reserve force, the Local Defence Force, in County Mayo.